1. Why/how?
2. Fair point, however we all know that the Mono Trial is the best trials brake available.
3. You can do that with IS mount, and it;s more guesswork with post mount than with IS - at least with IS you KNOW how much you are adjusting the caliper by (the thickness of the shim used).
4. Nope, it's heavier
5. That's bad, it means we now have two different types of brake mount in trials. As soon as any adaptors are required customers get confused as it is, this makes it even worse!